Sit up straight, align your head with your body and take a few deep breaths. You probably need to, I know I do.
Roll your head around a few times (skip looking up to the ceiling if you are worried about that issue). If you can stand up and touch your goes, so a bit of movement and stretching.
Take a few minutes to wake up your body, stretching, get a drink of water. Look out a window, connect with someone. Enjoy the rest of your day.